Tests: Generalise testing 'CREATE TABLE' migrations

* gn3/settings.py: Omit trailing slash
* tests/unit/auth/test_create_table_migrations.py: Generalise testing
  migrations that create tables.
* tests/unit/auth/test_create_user_credentials_table.py: delete
* tests/unit/auth/test_migration_create_users_table.py: delete

3 files changed, 61 insertions, 86 deletions

diff --git a/tests/unit/auth/test_create_table_migrations.py b/tests/unit/auth/test_create_table_migrations.py
new file mode 100644
index 0000000..8bc8fe1
--- /dev/null
+++ b/tests/unit/auth/test_create_table_migrations.py
@@ -0,0 +1,61 @@
+"""Test migrations that create tables"""
+from contextlib import closing
+
+import pytest
+import sqlite3
+
+from gn3.migrations import get_migration, apply_migrations, rollback_migrations
+from tests.unit.auth.conftest import (
+    apply_single_migration, rollback_single_migration, migrations_up_to)
+
+migrations_and_tables = (
+    ("20221103_01_js9ub-initialise-the-auth-entic-oris-ation-database.py",
+     "users"),
+    ("20221103_02_sGrIs-create-user-credentials-table.py", "user_credentials"),
+    ("20221108_01_CoxYh-create-the-groups-table.py", "groups"))
+
+@pytest.mark.unit_test
+@pytest.mark.parametrize("migration_file,the_table", migrations_and_tables)
+def test_create_table(
+        auth_testdb_path, auth_migrations_dir, backend, all_migrations,
+        migration_file, the_table):
+    """
+    GIVEN: A database migration script to create table, `the_table`
+    WHEN: The migration is applied
+    THEN: Ensure that the table `the_table` is created
+    """
+    migration_path=f"{auth_migrations_dir}/{migration_file}"
+    older_migrations = migrations_up_to(migration_path, auth_migrations_dir)
+    apply_migrations(backend, older_migrations)
+    with closing(sqlite3.connect(auth_testdb_path)) as conn, closing(conn.cursor()) as cursor:
+        cursor.execute("SELECT name FROM sqlite_schema WHERE type='table'")
+        result = cursor.fetchall()
+        assert the_table not in [row[0] for row in cursor.fetchall()]
+        apply_single_migration(auth_testdb_path, get_migration(migration_path))
+        cursor.execute("SELECT name FROM sqlite_schema WHERE type='table'")
+        assert the_table in [row[0] for row in cursor.fetchall()]
+
+    rollback_migrations(backend, older_migrations)
+
+@pytest.mark.unit_test
+@pytest.mark.parametrize("migration_file,the_table", migrations_and_tables)
+def test_rollback_create_table(
+        auth_testdb_path, auth_migrations_dir, backend, migration_file,
+        the_table):
+    """
+    GIVEN: A database migration script to create the table `the_table`
+    WHEN: The migration is rolled back
+    THEN: Ensure that the table `the_table` no longer exists
+    """
+    migration_path=f"{auth_migrations_dir}/{migration_file}"
+    older_migrations = migrations_up_to(migration_path, auth_migrations_dir)
+    apply_migrations(backend, older_migrations)
+    with closing(sqlite3.connect(auth_testdb_path)) as conn, closing(conn.cursor()) as cursor:
+        apply_single_migration(auth_testdb_path, get_migration(migration_path))
+        cursor.execute("SELECT name FROM sqlite_schema WHERE type='table'")
+        assert the_table in [row[0] for row in cursor.fetchall()]
+        rollback_single_migration(auth_testdb_path, get_migration(migration_path))
+        cursor.execute("SELECT name FROM sqlite_schema WHERE type='table'")
+        assert "the_table" not in [row[0] for row in cursor.fetchall()]
+
+    rollback_migrations(backend, older_migrations)
diff --git a/tests/unit/auth/test_create_user_credentials_table.py b/tests/unit/auth/test_create_user_credentials_table.py
deleted file mode 100644
index 72b7dd7..0000000
--- a/tests/unit/auth/test_create_user_credentials_table.py
+++ /dev/null
@@ -1,47 +0,0 @@
-"""Test the auth database initialisation migration."""
-from contextlib import closing
-
-import pytest
-import sqlite3
-
-from gn3.migrations import get_migration, apply_migrations, rollback_migrations
-from tests.unit.auth.conftest import (
-    apply_single_migration, rollback_single_migration, migrations_up_to)
-
-migration_path = "migrations/auth/20221103_02_sGrIs-create-user-credentials-table.py"
-
-@pytest.mark.unit_test
-def test_create_user_credentials_table(auth_testdb_path, backend, all_migrations):
-    """
-    GIVEN: A database migration script to create the `user_credentials` table
-    WHEN: The migration is applied
-    THEN: Ensure that the table is created
-    """
-    older_migrations = migrations_up_to(migration_path, "migrations/auth/")
-    apply_migrations(backend, older_migrations)
-    with closing(sqlite3.connect(auth_testdb_path)) as conn, closing(conn.cursor()) as cursor:
-        cursor.execute("SELECT name FROM sqlite_schema WHERE type='table'")
-        result = cursor.fetchall()
-        assert "users_credentials" not in [row[0] for row in cursor.fetchall()]
-        apply_single_migration(auth_testdb_path, get_migration(migration_path))
-        cursor.execute("SELECT name FROM sqlite_schema WHERE type='table'")
-        assert "user_credentials" in [row[0] for row in cursor.fetchall()]
-
-    rollback_migrations(backend, older_migrations)
-
-@pytest.mark.unit_test
-def test_rollback_create_user_credentials_table(auth_testdb_path, backend):
-    """
-    GIVEN: A database migration script to create the `user_credentials` table
-    WHEN: The migration is rolled back
-    THEN: Ensure that the `user_credentials` table no longer exists
-    """
-    older_migrations = migrations_up_to(migration_path, "migrations/auth/")
-    apply_migrations(backend, older_migrations)
-    with closing(sqlite3.connect(auth_testdb_path)) as conn, closing(conn.cursor()) as cursor:
-        apply_single_migration(auth_testdb_path, get_migration(migration_path))
-        rollback_single_migration(auth_testdb_path, get_migration(migration_path))
-        cursor.execute("SELECT name FROM sqlite_schema WHERE type='table'")
-        assert "user_credentials" not in [row[0] for row in cursor.fetchall()]
-
-    rollback_migrations(backend, older_migrations)
diff --git a/tests/unit/auth/test_migration_create_users_table.py b/tests/unit/auth/test_migration_create_users_table.py
deleted file mode 100644
index 74f2020..0000000
--- a/tests/unit/auth/test_migration_create_users_table.py
+++ /dev/null
@@ -1,39 +0,0 @@
-"""Test the auth database initialisation migration."""
-from contextlib import closing
-
-import pytest
-import sqlite3
-
-from gn3.migrations import get_migration, apply_migrations, rollback_migrations
-from tests.unit.auth.conftest import (
-    apply_single_migration, rollback_single_migration)
-
-migration_path = "migrations/auth/20221103_01_js9ub-initialise-the-auth-entic-oris-ation-database.py"
-
-@pytest.mark.unit_test
-def test_create_users_table(auth_testdb_path):
-    """
-    GIVEN: A database migration script to create the `users` table
-    WHEN: The migration is applied
-    THEN: Ensure that the table is created
-    """
-    with closing(sqlite3.connect(auth_testdb_path)) as conn, closing(conn.cursor()) as cursor:
-        cursor.execute("SELECT name FROM sqlite_schema WHERE type='table'")
-        result = cursor.fetchall()
-        assert "users" not in [row[0] for row in cursor.fetchall()]
-        apply_single_migration(auth_testdb_path, get_migration(migration_path))
-        cursor.execute("SELECT name FROM sqlite_schema WHERE type='table'")
-        assert "users" in [row[0] for row in cursor.fetchall()]
-
-@pytest.mark.unit_test
-def test_rollback_create_users_table(auth_testdb_path):
-    """
-    GIVEN: A database migration script to create the `users` table
-    WHEN: The migration is rolled back
-    THEN: Ensure that the `users` table no longer exists
-    """
-    with closing(sqlite3.connect(auth_testdb_path)) as conn, closing(conn.cursor()) as cursor:
-        apply_single_migration(auth_testdb_path, get_migration(migration_path))
-        rollback_single_migration(auth_testdb_path, get_migration(migration_path))
-        cursor.execute("SELECT name FROM sqlite_schema WHERE type='table'")
-        assert "users" not in [row[0] for row in cursor.fetchall()]